package string;

public class StringStringBuilderDemo {
    public static void main(String[] args) {
        System.out.println("执行完毕");
        StringBuilder s=new StringBuilder("a");
        for (int i=0;i<10000000;i++){
            s.append(i);

        }
        /*
        String s="a";
        for (int i=0;i<10000000;i++){
            s = s+i;
            }
         */
        }


    }

